make SpecialLineRec::addSegment assert more permissive to accomodate rounding error

src/utils/SkDashPath.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDashPathPriv.h"
 #include "SkPathMeasure.h"
 #include "SkStrokeRec.h"
@@ skipping 168 matching lines @@
         ptCount = SkTMin(ptCount, SkDashPath::kMaxDashCount);
         int n = SkScalarCeilToInt(ptCount) << 2;
         dst->incReserve(n);
 
         // we will take care of the stroking
         rec->setFillStyle();
         return true;
     }
 
     void addSegment(SkScalar d0, SkScalar d1, SkPath* path) const {
-        SkASSERT(d0 < fPathLength);
+        SkASSERT(d0 <= fPathLength);
         // clamp the segment to our length
         if (d1 > fPathLength) {
             d1 = fPathLength;
         }
 
         SkScalar x0 = fPts[0].fX + SkScalarMul(fTangent.fX, d0);
         SkScalar x1 = fPts[0].fX + SkScalarMul(fTangent.fX, d1);
         SkScalar y0 = fPts[0].fY + SkScalarMul(fTangent.fY, d0);
         SkScalar y1 = fPts[0].fY + SkScalarMul(fTangent.fY, d1);
 
@@ skipping 136 matching lines @@
     SkScalar length = 0;
     for (int i = 0; i < count; i++) {
         if (intervals[i] < 0) {
             return false;
         }
         length += intervals[i];
     }
     // watch out for values that might make us go out of bounds
     return length > 0 && SkScalarIsFinite(phase) && SkScalarIsFinite(length);
 }